Lens 'overlap'

KOsey wrote:

Buchanan wrote:

I guess you already know that the 24-105 will be wider on the FF 6D than your 18-55 was on your rebel; the 24 on FF being like a 15 on crop, so you will pick up some additional "wide angle" just going this route. So I would say if you always felt like you needed the 10-22 for your T3i, and you feel you need considerably wider than what you had before then go for it, you will definitely see a difference between a 17 and a 24 FL on the FF. Nothing at all wrong with the overlap in the 24-40 range, I would prefer some as it might cut down on some lens changing.

I did know there would be a difference in effective focal length with the FF but didn't know how to convert so you may have just saved me $739 (at least in the short term)....thank you!! I'm pretty happy with the wide end of my 18-55 now, so I'll probably be happy with the 24 if it's effectively even wider. Thank you for what sounds like good advice.

The cropfactor (1.6 for Canon) is a sensor (body) related figure, the focallenght OF THE LENS is a lens related figure, the two combined (multiplied) give you the focallenght FF equivalent.

So If a 15-85 (EF-S) lens says 15-85 on it it technically is correct (even if it will not fit on a FF camera).

OT 24-105 imo looks like a fantastic lens for walkaround on 6D, though I never had either.

I use a 15-85 on 7D (makes it 24-136 ff eq.) I really love that lens.